[OpenLayers-Users] Zooming with mouseWheel causes zooming by 2 levels instead of 1

[Alessandro Ferrucci]

Hello,
I have a map and when I zoom using the mouse wheel the map zooms by 2 zoom
levels instead of 1 when I move the mouse wheel slightly.

instead if I double click the map or click up or down on the zoom control it
zooms in or out by 1 zoom level.

Here is the relevant code:

map = new OpenLayers.Map(
                    'map',
                    {
                        'maxResolution':'auto',
                        'tileSize':new OpenLayers.Size(200,200),
                        maxExtent: new OpenLayers.Bounds(-180, -90, 180,
90),
                        controls:[
                            new OpenLayers.Control.Navigation(),
                            new OpenLayers.Control.ArgParser(),
                            new OpenLayers.Control.Attribution(),
                            new OpenLayers.Control.PanZoomBar({ position:
new OpenLayers.Pixel(2, 15) }),
                            new OpenLayers.Control.Navigation(),
                            new OpenLayers.Control.Scale($('scale')),
                            new OpenLayers.Control.LayerSwitcher(),
                            new OpenLayers.Control.MousePosition(),
                            new OpenLayers.Control.Permalink()
                        ]
                    }
                );

                layer0 = new OpenLayers.Layer.WMS(
                    "CIRA Base Layer", urlArray,
                    {
                        layers:'cira_base',
                        format:'image/png',
                        bgcolor: '#99B3CC'
                    },
                    {singleTile:false, transitionEffect: 'resize'}
                );

map.addLayers([layer0]);

                map.zoomToMaxExtent();

                map.setCenter(new OpenLayers.LonLat(-100.42306,40.35960),1);

Any ideas as to why this would be happening?

thank you very much!

-- 
Signed,
Alessandro Ferrucci
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